package com.example.demo.interceptor;
import com.example.demo.annotation.IgnoreAuth;
import com.example.demo.utils.R;
import com.example.demo.utils.TokenUtil;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import org.json.JSONObject;
import java.io.PrintWriter;
import java.util.Date;


/**
 * 权限(Token)验证
 */
@Component
public class AuthorizationInterceptor implements HandlerInterceptor {

    public static final String LOGIN_TOKEN_KEY = "Authorization";

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        //支持跨域请求
        response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
        response.setHeader("Access-Control-Max-Age", "3600");
        response.setHeader("Access-Control-Allow-Credentials", "true");
        response.setHeader("Access-Control-Allow-Headers", "x-requested-with,request-source,Token, Origin,imgType, Content-Type, cache-control,postman-token,Cookie, Accept,authorization");
        response.setHeader("Access-Control-Allow-Origin", request.getHeader("Origin"));
        // 跨域时会首先发送一个OPTIONS请求，这里我们给OPTIONS请求直接返回正常状态
        if (request.getMethod().equals(RequestMethod.OPTIONS.name())) {
            response.setStatus(HttpStatus.OK.value());
            return false;
        }

        IgnoreAuth annotation;
        if (handler instanceof HandlerMethod) {
            annotation = ((HandlerMethod) handler).getMethodAnnotation(IgnoreAuth.class);
        } else {
            return true;
        }

        //从header中获取token
        String token = request.getHeader(LOGIN_TOKEN_KEY);
        System.out.println(token);
        /**
         * 不需要验证权限的方法直接放过
         */
        if(annotation!=null) {
            return true;
        }
        if(!TokenUtil.isAvailable(token)){
            System.out.println(token);
            PrintWriter writer = null;
            response.setCharacterEncoding("UTF-8");
            response.setContentType("application/json; charset=utf-8");
            try {
                writer = response.getWriter();
                writer.print(JSONObject.valueToString(R.error(401, "请先登录")));
            } finally {
                if(writer != null){
                    writer.close();
                }
            }
            return false;
        }

//				throw new EIException("请先登录", 401);
        return true;
    }
    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse,
                           Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println(new Date());

    }

    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse,
                                Object o, Exception e) throws Exception {
        System.out.println("***********");

    }
}
